/*******************************************************************************************
 * Copyright (c) 2009 Alex Robson, Rob Simmons, Craig Israel, and Rachel Twyford
 *
 * Use of this software in any form requires that you have both 
 * read and agreed to the following terms:
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation 
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions: 
 *
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, 
 * this list of conditions and the following disclaimer in the 
 * documentation and/or other materials provided with the distribution.
 * Neither the name of Nvigorate nor the names of its contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL ANY CONTRIBUTOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ****************************************************************************************/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;
using Nvigorate.Common;
using Nvigorate.Common.Reflection;
using Nvigorate.Xml;

namespace Nvigorate.Data.Query
{
    [Serializable]
    public class SchemaColumn : BaseColumn<SchemaColumn>, ITypeDefinition
    {
        #region Protected Fields

        protected List<object> _typeSpecification;
        protected Type _type;

        #endregion
        
        #region Properties

        public List<object> TypeSpecification
        {
            get { return _typeSpecification; }
            set { _typeSpecification = value; }
        }

        internal string TypeSpecAttribute
        {
            get
            {
                return DelimitedBuilder.Construct(_typeSpecification.Select(t => t.ToString()), ", ");
            }
            set
            {
                _typeSpecification.AddRange(value.Split(',').Select(s => s.Trim()).ToArray());
            }
        }

        public Type ColumnType
        {
            get { return _type; }
            set { _type = value; }
        }
        
        #endregion
        
        #region Helper Methods and Constructor

        public SchemaColumn IsIdentity()
        {
            _identity = true;
            return this;
        }

        public SchemaColumn IsPrimaryKey()
        {
            _primaryKey = true;
            return this;
        }

        public SchemaColumn Type(Type columnType)
        {
            _type = columnType;
            return this;
        }

        public SchemaColumn TypeArgs(params object[] typeSpecifications)
        {
            _typeSpecification = typeSpecifications.ToList();
            return this;
        }

        public static implicit operator Column(SchemaColumn column)
        {
            return new Column()
                       {
                           Alias = column.Alias,
                           Name = column.Name,
                           Owner = column.Owner
                       };
        }

        public SchemaColumn()
            : base("")
        { }

        public SchemaColumn(string name)
            : base(name)
        {
        }

        #endregion

        public override object ParseXElement(XElement element)
        {
            _name = element.GetAttributeValue("name") ?? "";
            _alias = element.GetAttributeValue("alias") ?? "";
            _owner = element.GetAttributeValue("owner") ?? "";
            _primaryKey = bool.Parse(element.GetAttributeValue("primaryKey") ?? "false");
            _identity = bool.Parse(element.GetAttributeValue("identity") ?? "false");
            _type = Reflector.LoadType(element.GetAttributeValue("type") ?? "System.Object, System");
            TypeSpecAttribute = element.GetAttributeValue("typeSpec") ?? "";
            return this;
        }

        public override XElement GetXElementRepresentation()
        {
            return new XElement("column",
                    new XAttribute("name", _name),
                    new XAttribute("alias", _alias),
                    new XAttribute("owner", _owner),
                    new XAttribute("identity", _identity),
                    new XAttribute("primaryKey", _primaryKey),
                    new XAttribute("type", _type.FullName),
                    new XAttribute("typeSpec", TypeSpecAttribute)
                );
        }
    }
}